I guess I'm showing my ignorance here, but I always thought that the professional that's installing the engine would know what the proper setting was for the "
X" dimension. I mean, if they don't know, then how the hell should the owner know?
Personally, I'm pretty much with MJ on this one. I've always set my cavatation plate to be even with the keel, and then I usually sink it an additional inch lower for good measure. Might not be the most accurate way, but it's always seemed to work ok for me.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God)
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.